American Printing House for the Blind



Working with Matrices

• Entering matrices.

• Turn calculator on by pressing the ON key on the TI-84 Plus keypad. It is the bottom key in the first column. The calculator will announce the screen it is on and vibrate.

• Go to MATRIX (2nd, x-1 on the TI-84 Plus). The calculator announces that you are in the NAMES Menu.

• Use the TI-84 Plus right arrow to find EDIT, and the calculator announces you are in Edit and at Matrix A. Select 1:[A] by pressing the Orion TI-84 Plus ENTER key.

• Select your dimensions. (2 X 2) (3 X 4), etc. We’ll select 2 X 2. Press 2 and ENTER. Press 2 and ENTER (all on the TI-84 Plus).

• You are now ready to enter your data and press ENTER as you insert each entry. The calculator automatically moves you across the first row and then each subsequent row. The calculator announces each entry and its location by row and column. Use the entries below to fill your matrix.

[1 2]

[3 4]

• Go back to MATRIX (2nd, x-1 on the TI-84 Plus).

• Use the TI-84+ right arrow to find EDIT, use the TI-84 Plus down arrow to find 2:[B]and press the TI-84 Plus ENTER key to select.

• Select your dimensions. (2 X 2) (3 X 4), etc. We’ll select 2 X 2.

• Enter your data and press the Orion TI-84 Plus ENTER key as you insert each entry. Use the entries below to fill your matrix.

[5 6]

[7 8]

• Add, Subtract, or Multiply Matrices.

• Go to the home screen (2nd, Mode on the Orion TI-84 Plus) and the calculator announces “Quit.”

• Go to MATRIX (2nd, x-1 on the Orion TI-84 Plus), and the calculator announces you are in the Names Menu and at Matrix A. Select 1:[A] by pressing the Orion TI-84 Plus ENTER key.

• Matrix A appears on your home screen, and the calculator announces this.

• Enter a “+”, “-“ or “*” (from the TI-84 Plus) to add, subtract, or multiply the two matrices.

• Go back to MATRIX (2nd, x-1 on the Orion TI-84 Plus), and the calculator announces you are in the Names Menu and at Matrix A. Use the Orion TI-84 Plus down arrow to find 2: [B] and press the Orion TI-84 Plus ENTER key to select it.

• Press the Orion TI-84 Plus ENTER key once again to get the final matrix calculation. If we entered an incorrect dimension match, it will give us an error message. The calculator will read each entry in the matrix row by row.

• Find the determinant of [A].

• Go to MATRIX (2nd, x-1 on the Orion TI-84 Plus) and use the TI-84 Plus right arrow to find MATH.

• Select 1:det by pressing ENTER on the Orion TI-84 Plus.

• “det(“ appears on your screen, and the calculator announces “determinant.”

• Go to MATRIX (2nd, x-1 on the Orion TI-84 Plus) and select 1:[A] by pressing ENTER on the Orion TI-84 Plus.

• Press the Orion TI-84 Plus ENTER key once again to find the determinant.

• Find the inverse of [A].

• Go to MATRIX (2nd, x-1 on the Orion TI-84 Plus) and select 1:[A] by pressing ENTER on the Orion TI-84 Plus.

• Press the x-1 key and then the ENTER key on the Orion TI-84 Plus to find the inverse.

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